The literature has suggested that marijuana smoking increases the risk of head and neck cancer and lung malignancies, and that these tumors tend to develop earlier and behave more aggressively in marijuana smokers.

If they are getting chemotherapy for their bladder cancer and smoking marijuana to increase their appetite, they may be undoing the benefits of chemotherapy.

Smoking appears to confer a modest elevation in breast cancer risk, ... Certainly this relationship is not as strong as the relationship between smoking and lung cancer or smoking and heart disease, but breast cancer may be another disease to add to the long list of diseases associated with smoking.

We noticed several younger patients who had developed transitional cell carcinoma were similar in that they all shared a history of marijuana smoking.

Alcohol is probably the main factor responsible for increased risk of head and neck cancer recorded in various countries, particularly in central and east Europe.

Both drugs lower the risk of developing breast cancer by 50%.